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Is this a normal S-Series oil drain plug hole?

One of my "new" 2002 SC2s leaks oil from the drain plug.

I pulled the way over tightened plug and found a weird, over complicated looking drain plug hole. I don't remember my old 99 SL having a drain plug hole that looked like this. And my intuition tells met this cannot NOT leak. Am I mistaken?

I believe the round scoring around it is from the ginormous flange on the way over tightened plug.

To me it looks like a funky thread repair job. It appears to be a really big round hole filled with a round insert, containing a hexagonal insert, containing another hexagonal insert, which is meant to be plugged with a round thing.

The rubber washer does NOT seal it. The aluminum crush washer just barely covers it, but only after it is actually crushed. Prior to tightening it down, there was a visible gap where the hex corner protruded past the edge of the washer. I fully expect this to continue leaking.

Now that I'm looking at this on computer monitor...it looks like there is a valley next to the threaded area... that is not normal. You may have an aftermarket pan. Or...maybe someone did a crappy thread repair that replaced the original bung.

drain plug, drain plug gasket, sc2

I ordered some rubber gaskets from Rockauto. I ordered the AC Delco part # 21007240. The description says "O-RING SEAL IS TO BE USED ONLY WITH AN OIL PAN DRAIN PLUG THAT HAS AN O-RING GROOVE."

But when I compare the ACD gasket with whatever it was I pulled of my car, the Delco is a lot bigger. The drain plug has a o-ring groove, but the groove is the same size as the smaller one I pulled off the plug. The Delco covers it completely.

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